/Engine/Source/Developer/BSPUtils/Public/BSPOps.h
static void SplitPolyList ( [UModel](API\Runtime\Engine\UModel) * Model, int32 iParent, [ENodePlace](API\Developer\BSPUtils\FBSPOps\ENodePlace) NodePlace, int32 NumPolys, [FPoly](API\Runtime\Engine\Engine\FPoly) ** PolyList, [EBspOptimization](API\Developer\BSPUtils\FBSPOps\EBspOptimization) Opt, int32 Balance, int32 PortalBias, int32 RebuildSimplePolys )